Ruggerini SERIES RY

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35.0

service

00497R0990 - 15-07-2000

T.D.C.T.D.C.

T.D.C.

FIG. 1FIG. 1

FIG. 1

FIG. 2FIG. 2

FIG. 2

I.P.I.P.

I.P.

P.M.S.P.M.S.

P.M.S.

T.D.C. T.D.C.

T.D.C. = top dead center

h = extent of piston lowering in

relation to T.D.C.

a = angle corresponding to piston

lowering in relation to T.D.C.

I.P. I.P.

I.P. = start of delivery

Proceed in the following way:

1) Remove the cover from the rocker arms.

2) Demount the recoil and turn the drive shaft to the valve regulation position.

(This operation is carried out by means of the fylwheel nut, using a N° 32 socket wrench).

3) Demount the intake or exhaust rocker arm, the valve spring and caps.

4) Rest the valve top on the crown of the T.D.C. balanced piston (fig.1).

WARNING: The valve slips from its guide if the piston is lowered by turning the drive shaft more than 1/4 of a pipe wrenchWARNING: The valve slips from its guide if the piston is lowered by turning the drive shaft more than 1/4 of a pipe wrench

WARNING: The valve slips from its guide if the piston is lowered by turning the drive shaft more than 1/4 of a pipe wrench

turn.turn.

turn.

5) Position a comparator mounted on a magnetic pedestal or dummy injector and reset it on the valve stem (fig.1).

6) Slowly turn the drive shaft in an anti-clockwise direction and check the comparator to make sure that the piston drops about 5 mm

in relation to T.D.C. (dimension "h" - fig. 2).

7) Slowly turn the drive shaft in a clockwise direction and check the comparator to make sure that the piston rises by the values

indicated in the following table, in relation to T.D.C. (dimension "h" - fig. 2):

8) Remove the injection tube and mount the capillary tube

code 365.94code 365.94

code 365.94 on the injection pump delivery fitting (fig. 3).

9) Turn the accelerator lever to the MAX position and the stop lever to about half travel.

10) Turn the drive shaft anti-clockwise by no more than 1/4 of the pipe wrench turn.

11) Pressurize the circuit by turning the drive shaft several times in an alternate clockwise/anti-clockwise way until fuel splashes out

of the calibrated hole of the capillary tube.

12) Turn the drive shaft and check the comparator to make sure that the piston drops about 10 mm in relation to T.D.C. (dimension

(quota "h" - fig. 2).

13) Shake the capillary tube until an air bubble forms inside it (fig. 3).

14) Turn the drive shaft in a clockwise direction very slowly and check the position of the air bubble in the capillary tube. A small

movement of this bubble will indicate the exact lead position. This value must correspond to the one previously read on the

comparator (see point 7). If this is not the case, add or remove seals to or from the injection pump according to the corrections

indicated in the following table:

LEAD

4.12 mm

24°

SUGGESTIONS ON HOW TO TIME THE INJECTION PUMP WHEN THE LEAD PUNCH MARKS ON

THE FLYWHEEL ARE DIFFICULT TO REACH.

(Consult chapter 12.17 on page 29 for a description of the conventional adjustment)

Seal thickness for lead Seal thickness for lead

Seal thickness for lead

correctioncorrection

correction

3.50

3.80

4.124.12

4.12

4.50

4.85

22°

23°

24°24°

24°

25°

26°

- 0.2 mm

- 0.1 mm

+ 0.1 mm

+ 0.2 mm

Value off tolerance

Value in MIN. tolerance

STD. LEADSTD. LEAD

STD. LEAD

Value in MAX. tolerance

Value off tolerance

Comparative lead adjustment tableComparative lead adjustment table

Comparative lead adjustment table

FIG. 3FIG. 3

FIG. 3

Injection pumpInjection pump

Injection pump

Capillary tubeCapillary tube

Capillary tube

365.94365.94

365.94

Bolla d'ariaBolla d'aria

Bolla d'aria

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